VMAX – Expanding a Thin pool via symcli

We had discussed about deleting a Thin pool here in one of our previous post. Now we will discuss how to expand a thin pool via symcli, i.e, adding more TDATs to the pool.

We can first make a note of pool details by running,

symcfg -sid 1234 show -pool T_Pool_1 -thin -detail

We have to identify the candidate TDATs, which can be added to the pool. We have to find the nonpooled TDAT devices from the required disk group.

symdev list -sid 1234 -datadev -disk_group 3 -nonpooled

This will list all the TDATs from disk group 3 which are not part of any pool. We can select the devices as per our size requirements etc… Here we have identified the devices AAAA through BBBB as the candidate TDATs.

Once you have the devices added and enabled , you will be able to see the new TDATs under the enabled devices in show -pool command output. Now the data is there in the existing TDATs and you will have to do a re-balancing of the data in pool by running the below command,

You can verify the pool state by running the show -pool command. The pool state now should be rebalancing from enabled.

Now you may change the maximum subscription limit for the pool. If you don’t want over subscription for the pool, you may set the maximum subscription percent as 100, otherwise can be some values higher than 100.